<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <style>
       #equipment-active .active  {
            background-color: red;
        }
    </style>
</head>
<body>

<div id="equipment-active">

    <li class="active" ><a href='javascript:;'>风机</a><span></span></li>
</div>


</body>
</html>